The Kone MRL not only saves MR space but uses motors with small HP that require little power.
That's why they have designed a special command in the LCE to "jog" a car off the safeties (full load testing maybe?) as not much power is available.
Power savings = money savings = selling point long term over hydro's.
Cabs are very light boxes and roped 4:1, 8:1, etc
Like any elevator, empty car down is the most power a machine will ever use/need.
If an empty cab does not move (when the demand is down) for even the slightest moment there will be a mismatch between encoders.
It thinks: one's moving, one's not. You're done.
Grease or dry rails can cause this delayed movement of cab.
As mentioned: Use lube devices designed for the purpose of running up and down the hoistway leaving a light film of oil on rails.
If you have a unit that parks for a long period of time, minimal use environment, it will not oil rails properly.
These elevators are slow.
Guide inserts should not be that big of a deal.